Copper Alloy C51000-H04 vs C51000-O
Copper Alloy · C51000 temper comparison
C51000-H04 and C51000-O are two conditions of the same copper alloy grade, C51000: H04 (full hard) versus O (annealed). The chemistry is identical, so every difference below comes from the condition. C51000-H04 is the stronger of the two: yield strength 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C51000-O, about 3.7 times as much; tensile strength follows at 560 MPa (81.2 ksi) vs 340 MPa (49.3 ksi). In exchange, C51000-O is the more ductile: elongation 60% versus 12% for C51000-H04, and C51000-H04 is harder (180 HV vs 85 HV). C51000-O runs hotter in service (200°C vs 150°C continuous). On the shop floor, C51000-H04 machines more easily (fair vs poor).
C51000-H04Choose it when strength drives the design, or when the part is machined in volume.
C51000-OChoose it when the part is bent, formed or impact-loaded, or when the part sees heat.
C51000-H04 vs C51000-O: propertiesHow to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
How to read these bars
- One bar per material. A full bar is the highest value among all copper alloy grades in the FabDigit library; each bar is drawn as a share of that.
- The better value (by the usual engineering direction) is in bold. Rows with no direction — density, thermal conductivity — have no bold.
- Values are typical room-temperature figures for the condition named on each card.
- Confirm against the certified mill or resin datasheet before design release.
Mechanical
Strength, stiffness, ductility and hardness at room temperature.
Tensile Strength (Ultimate)
Yield Strength (0.2% offset)
Elongation at Break
Shear Strength
Fatigue Strength (Endurance Limit)
Hardness, Vickers
Same in both: Elastic (Young's) Modulus 110 GPa16 Msi · Shear Modulus 41 GPa5.9 Msi · Bulk Modulus 115 GPa16.7 Msi · Poisson's Ratio 0.34 · Hardness, Brinell 80 HB
Physical
Density and transition temperatures.
Same in both: Density 8.86 g/cm³0.32 lb/in³ · Melting Point (Solidus) 954°C1,749 °F · Liquidus Temperature 1,049°C1,920 °F
Thermal
How each material carries heat and how hot it can run.
Max Service Temperature (continuous)
Same in both: Thermal Conductivity 69 W/m·K39.9 BTU/hr·ft·°F · Specific Heat Capacity 380 J/kg·K0.09 BTU/lb·°F · Thermal Expansion (CTE, 20–100 °C) 17.8 µm/m·K9.9 µin/in·°F · Latent Heat of Fusion 200 J/g86 BTU/lb · Min Service Temperature -200°C-328 °F
Electrical
Conductivity and insulation.
Same in both: Electrical Conductivity 15 % IACS · Electrical Resistivity 1.15×10⁻⁷ Ω·m4.53 µΩ·in
Chemical & Environmental
Corrosion and environmental resistance (0–100 scores).
Same in both: Galvanic Potential (seawater, vs SCE) -0.3 V · Corrosion Resistance 68 / 100
Manufacturability
FabDigit workshop ratings (0–100 scores) — how each material behaves on the machine.
Machinability
Formability (cold)
Same in both: Machinability Rating (AISI 1212 = 100 %) 20% · Weldability 45 / 100 · Castability 30 / 100 · Brazeability / Solderability 90 / 100 · Polishability 75 / 100
Sustainability
Primary-production footprint per kilogram.
Same in both: Embodied Energy (primary production) 68 MJ/kg29,235 BTU/lb · Embodied Carbon (primary production) 4.3 kg CO₂/kg · Embodied Water 260 L/kg31.2 gal/lb · Typical Recycled Content 40%
Strength versus weight
Yield strength against density for every copper alloy grade in the FabDigit library; the compared grades are highlighted. Up and left is stronger for its weight.
C51000-H04 vs C51000-O — frequently asked
Is C51000-H04 stronger than C51000-O?
Yes. C51000-H04 has a typical yield strength of 515 MPa (74.7 ksi) against 140 MPa (20.3 ksi) for C51000-O — about 3.7 times as much. Tensile strength is 560 MPa (81.2 ksi) vs 340 MPa (49.3 ksi).
Which condition does FabDigit quote by default, H04 or O?
O is the default C51000 condition in the FabDigit quote flow. The other condition is available on request or by drawing note — specify it in the material field or the part notes and the quote is priced for it.
Which is easier to machine, C51000-H04 or C51000-O?
C51000-H04. Its machinability rates fair (35/100) against poor (25/100) for C51000-O.
Ready to make it?
Upload a CAD file and FabDigit prices the part in C51000-H04 and C51000-O side by side — material, machining time, tolerance and finish in one quote. Certified material data ships with the order on request.
Typical handbook values for the conditions named above, normalised for comparison. Hardness on non-Brinell scales is converted approximately for charting only. Request certified data with your order for design-critical properties.